JPH1099585A - Washing machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To accurately detect the quantity of wash to be washed, the water content, the quantity of vibration of a washing and dehydrating basket, a vibrating frequency, etc., by making a sensor of the washing machine in such a structure that a correct strain may be applied to each strain gage even if there is a slight variation in the height of supporting sections of supporting plates or an elastic plate has a little bad flatness, in the washing machine which has the sensor to detect the above quantities and frequency. SOLUTION: A water bucket 3 is suspended by a plurality of suspensions 29 in an outer frame 1 and a washing and dehydrating basket 5 is rotatably located in the water bucket 3. Between one of the suspensions 29 and the outer frame 1, a sensor 28 is plated which detects, from the changes in strain resistors, at least one quantity out of the weight applied to the water bucket 3, the vibration of the water bucket 3, the vibrating frequency, and a tilted angle of the outer frame. The sensor 28 is made by fastening a plurality of the strain gages on an elastic plate, which is supported at three points from the outer frame side, and has such a mechanism that the weight of the water bucket 3 may be applied in each supporting point through a pressure applicator 32 mechanically fixed to the top end of each of the suspensions 29.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a laundry amount, a water amount,
The present invention relates to a washing machine having a sensor for detecting a vibration amount, a vibration period, and the like.

[0002]

2. Description of the Related Art In recent years, washing machines have become more automated.
2. Description of the Related Art Fully automatic washing machines that include various sensors and automatically execute a washing process have become widespread.

[0003] The inventors dispose an elastic plate to which a plurality of strain resistors are fixed between one of the hanging rods for hanging the water receiving tank and the outer frame, and change the resistance value of the strain resistors. A sensor for detecting the weight, vibration amount, vibration period, and the like of the water receiving tank has been proposed. Hereinafter, the configuration will be described with reference to FIGS.

[0004] As shown in FIG. 8, the outer frame 1 has a water receiving tank 3 suspended by four suspension rods 2, one of which is suspended via a sensor 4. . A washing and dewatering tub (hereinafter referred to as a washing tub) 5 is rotatably disposed in the water receiving tub 3, and a stirring blade 6 is rotatably disposed at the bottom of the washing tub 5. The motor (drive means) 7 drives the stirring blade 6 and the washing tub 5 via the V-belt 8 and the speed reduction mechanism 9. 10 is a drain valve, 11 is a water supply valve, 12 is a lid, and 13 is a control device.

[0005] The control device 13 is configured as shown in FIG. 9, and the control means 14 sequentially controls the washing, rinsing, and dehydration processes based on the setting contents inputted by the operation display means 15. The motor 7, the water supply valve 11, the drain valve 10, and the like are sequentially controlled via the power switching means 16. The storage unit 17 stores data and the like necessary for the sequential control by the control unit 14. The weight etc. detecting means 18 determines a weight, a vibration amount, a fluctuation period and the like from a signal obtained by amplifying the displacement of the sensor 4 by the amplifier 19 and data of the storage means 17, and inputs its output to the control means 14. . In addition, 2
Reference numeral 0 denotes a capacitor for phase advance of the motor 7, reference numeral 21 denotes a power switch, and reference numeral 22 denotes a commercial power supply.

FIGS. 10 (a) and 10 (b) show the peripheral structure of the sensor 4. FIG. As shown in the figure, the support plate 23 is formed of resin and fixed to the outer frame 1. The support plate 23 includes support portions 23a,
3b, 23c and 23d are provided on the circumference, and a ring-shaped elastic plate 24 is arranged thereon. Distortion resistors 25a, 25b, 25c, 25d are provided on the lower surface of the elastic plate 24 at the support portions 23a,
It is fixed so as to be located between 23b, 23c and 23d.

[0007] A pressing body 26 is arranged on the elastic plate 24, and convex portions 26 a, 26 b, 26 c, 2
6d are provided at the positions of the strain resistors 25a, 25b, 25c, and 25d, and a spherical concave portion 26e is provided on the upper surface of the pressing body 26. A sliding member 27 having a spherical convex portion on the lower surface is placed on the spherical concave portion 26e, and the hanging rod 2 supporting the weight of the water receiving tank 3 is fixed to the sliding member 27.

The operation of the above configuration will be described. First,
When the laundry is put into the washing tub 5, the load is transmitted to the hanging rod 2 via the water receiving tub 3 and transmitted to the sliding body 27 fixed to the hanging rod 2. The load transmitted to the sliding body 27 is transmitted to the pressing body 26 via the joint surface between the sliding body 27 and the spherical concave portion 26e of the pressing body 26. The load transmitted to the pressurizing body 26 is the convex portions 26a, 26b, 26
c, 26d, the strain resistors 25a, 25 of the elastic plate 24
It is applied to positions b, 25c and 25d.

On the other hand, since the elastic plate 24 is supported from below by the support portions 23a, 23b, 23c, and 23d of the support plate 23, the strain resistors 25a, 25b, 25c, and 25d are bent, and the strain resistors 25a , 25b, 25c and 25d are distorted in accordance with the load of the loaded laundry.

The contact surface between the sliding member 27 and the pressing member 26 is formed of a spherical surface having substantially the same radius and is smooth, so that when the hanging bar 2 vibrates, the contact surface between the sliding member 27 and the pressing member 26 is increased. Slides, and the force in the lateral direction acts on the pressurizing body 26 very little, and almost acts as a force in the vertical direction. Therefore, almost all of the load applied to the hanging rod 2 is transmitted through the pressure body 26 to the strain resistors 25a, 25b, 25c, 2c.
In addition to 5d, the amount of change is amplified by the amplifier 19 and sent to the weight etc. detecting means 18 to determine the weight from the amount of change.

When the angle of the suspension rod 2 changes, the center of gravity of the load applied to the pressurizing body 26 moves.
The ratio of the load acting on the convex portions 26a, 26b, 26c, 26d changes, and the strain resistors 25a, 25b, 25c, 25
d, there is a difference in the amount of distortion.
Thus, the angle of the hanging rod 2 can be known.

[0012]

In such a conventional configuration, since the elastic plate 24 is supported at four points, the supporting plate 2
3 and the flatness of the elastic plate 24, depending on the variation in height of the support portions 23a, 23b, 23c, and 23d.
There has been a problem that the distortion amounts applied to a, 25b, 25c, and 25d vary. Further, the degree of contact at the contact portion between the support plate 23 made of resin and the elastic plate 24 made of metal changes due to a change in temperature, and there is a problem that the variation in the amount of strain shows a hysteresis phenomenon with respect to temperature.

The present invention solves the above-mentioned problems. Even if the height of the support portion of the support plate slightly varies, and even if the flatness of the elastic plate is slightly poor, the correct amount of strain is applied to each strain resistor. It is an object of the present invention to accurately detect the amount of laundry, the amount of water, the amount of vibration of the washing and dewatering tub, the vibration cycle, and the like.

[0014]

According to the present invention, in order to achieve the above object, a water receiving tub is suspended by a plurality of hanging rods in an outer frame, and a washing and dewatering tub is rotatably disposed in the water receiving tub. The washing and dewatering tub is rotated by a motor, and the motor and the like are controlled by a control device. A sensor is provided between one of the hanging rods and the outer frame to detect at least one of a weight applied to the water receiving tank, a vibration amount, a vibration period, and an inclination angle of the outer frame based on a change amount of the strain resistor. In this sensor, a plurality of strain resistors are fixed to an elastic plate, the elastic plate is supported at three points from the outer frame side, and a pressure member mechanically fixed to an upper portion of a hanging rod in each support point. Thus, the weight of the water receiving tank is applied.

Accordingly, even if the height of the support portion of the support plate slightly varies, and even if the flatness of the elastic plate is slightly poor,
Correct distortion amount is added to each distortion resistor, laundry amount, water amount,
It is possible to accurately detect the vibration amount, the vibration period, and the like of the washing and dewatering tub.

[0016]

DETAILED DESCRIPTION OF THE INVENTION The invention according to claim 1 of the present invention comprises an outer frame, a water receiving tank suspended by a plurality of hanging rods in the outer frame, and a rotatable water receiving tank. A disposed washing and dewatering tub, and driving means for rotating the washing and dewatering tub,
A control device for controlling the driving means and the like;
A sensor disposed between the book and the outer frame and configured to detect at least one of a weight, a vibration amount, a vibration cycle, and a tilt angle of the outer frame applied to the water receiving tank based on a change amount of the strain resistor. The sensor has a plurality of strain resistors fixed to an elastic plate, supports the elastic plate at three points from the outer frame side, and is mechanically fixed to an upper portion of the hanging bar in each of the support points. Through the body, configured to apply the weight of the water receiving tank,
Even if there is a slight variation in the height of the support portion of the support plate, or even if the flatness of the elastic plate is slightly poor, the amount of strain applied to each strain resistor by the load applied between each support point for three-point support Can be added, the amount of laundry, the amount of water, the amount of vibration of the washing and dewatering tub,
Vibration cycle and the like can be detected with high accuracy, and a hysteresis phenomenon can be removed even with a temperature change. In addition, the change in the angle of the hanging rod can be changed to the change in the load, accurately applied to each strain resistor, and detected.

According to a second aspect of the present invention, in the first aspect of the invention, a support plate having three points of support portions arranged in a substantially equilateral triangle is provided on the outer frame, and a substantially intermediate portion of the support portion is provided. Elastic plates each having a strain resistor fixed thereto are disposed on the support plate, and a pressing body having three convex portions on the lower surface is pressed with the elastic plate so that the convex portions come to the positions of the strain resistors. It is arranged so that the load of the hanging bar is applied to the pressing body, and even if the height of the support portion of the support plate slightly varies, the height of the convex portion of the pressing body is Even if there is variation, even if the flatness of the elastic plate is slightly poor, the correct amount of strain is applied to each strain resistor, so the laundry amount, water amount, vibration amount of the washing and dewatering tub with low accuracy parts, Vibration cycle and the like can be accurately detected. Further, since the support portion and the strain resistors are arranged in a substantially equilateral triangle, it is possible to easily calculate in which direction the load is applied from the amounts of change of the three strain resistors.

According to a third aspect of the present invention, in the second aspect, the support portion of the support plate and the convex portion of the pressing body are linearly formed in a direction perpendicular to the direction of the strain resistor. Or, the support point and the pressure point of the elastic plate become almost one point with respect to the strain resistor, the amount of strain applied to the strain resistor becomes more accurate, the amount of laundry, the amount of water, It is possible to more accurately detect the vibration amount, the vibration cycle, and the like of the water tank.

According to a fourth aspect of the present invention, in the first or second aspect of the present invention, the hanging bar and the pressing body are mechanically fixed, and the hanging bar has elasticity in a direction perpendicular to the axis. The small vibration of the suspension rod can be accurately transmitted to the strain resistor, and a part of the vibration of the water receiving tank is absorbed by the suspension rod so that excessive stress is not applied to the elastic plate. be able to.

According to a fifth aspect of the present invention, in the fourth aspect of the present invention, the elastic constant of the hanging rod is large with respect to the stress in the direction connecting the center of the washing and dewatering tub and the hanging rod, and Since it is configured to be small against stress, it is possible to apply vibration with a relatively small amount of vibration going out from the center of the washing and dewatering tub and large vibration in the rotation direction to the strain resistor with changing sensitivity. All vibrations can be detected within the dynamic range of the strain resistor.

According to a sixth aspect of the present invention, in the first or second aspect of the present invention, the elastic plate has a substantially equilateral triangular hole substantially at the center, and is provided at a predetermined distance from the hole on the side of the hole. A slit having a length of the side substantially in parallel is provided, and a strain resistor is fixed substantially at the center of a strip formed by the hole and the slit,
An amplifier that amplifies the amount of change in the strain resistor outside the slit and a resistor having the same composition as the strain resistor are provided, and wiring such as a lead wire is not required between the strain resistor and the amplifier. The noise resistance can be improved, and the temperature of the strain resistor can be compensated by the resistor provided in the peripheral portion, so that a stable signal can be output with respect to a temperature change.

The invention described in claim 7 is the above-mentioned claim 1 to claim 1.
In the invention described in Item 6, the elastic plate is configured to intersect the suspension bar at a substantially right angle, and the stress acting on the elastic plate in the horizontal direction is reduced, thereby preventing the elastic plate from moving in the horizontal direction. And the detection error due to the stress acting in the horizontal direction can be reduced.

[0023]

Embodiments of the present invention will be described below with reference to the drawings. The same components as those in the conventional example are denoted by the same reference numerals, and description thereof is omitted.

(Embodiment 1) As shown in FIG.
8 is disposed between one of the hanging rods 29 and the outer frame 1, and at least the weight, the vibration amount, the vibration period, and the washing machine outer frame inclination angle applied to the water receiving tank 3 based on the change amount of the strain resistor. One is detected, and the hanging bar 29 has elasticity in a direction perpendicular to the axis.

The sensor 28 is constructed as shown in FIGS. 2A and 2B. The support plate 30 is fixed to the outer frame 1 and has three support portions 30a, 30b, 30c. Elastic plate 3 in point
Support 1 The pressing body 32 is mechanically fixed to the hanging rod 29. The support portions 30a, 3
0b, 30c, the projections 32a, 32
b, 32c. At these three points, a load is applied to the positions of the strain resistors 33a, 33b, 33c fixed to the elastic plate 31. Other configurations are the same as the conventional example.

The operation of the above configuration will be described. First,
When the laundry is put into the washing tub 5, the load is transmitted to the hanging rod 29 via the water receiving tub 3 and transmitted to the pressurizing body 32 fixed to the hanging rod 29. The load transmitted to the pressing body 32 is increased by the convex portions 32a, 32b, and 32c of the pressing body 32.
Strain resistors 33a, 33b, 33c fixed to elastic plate 31
Is applied to the position.

On the other hand, since the elastic plate 31 is supported from below by the support portions 30a, 30b and 30c of the support plate 30,
The vicinity of the strain resistors 33a, 33b, and 33c is bent, and strain is generated in the strain resistors 33a, 33b, and 33c in accordance with the load of the loaded laundry. In response to this strain, the strain resistor 33
The resistance values of a, 33b, and 33c change, and the amount of water in the washing tub 5, the amount of the laundry put in, and the like can be known from the amount of change, and the control means 14 can perform appropriate control.
In addition, the rotation speed, vibration, and the like of the washing tub 5 during dehydration can be accurately detected. In addition, the hysteresis phenomenon can be removed even when the temperature changes.

When the angle of the suspension rod 29 changes, the ratio of the load acting on the projections 32a, 32b, 32c of the pressurizing body 32 changes, resulting in a difference in the amount of distortion of the strain resistors 33a, 33b, 33c. From this difference, the angle of the hanging rod 29 can be known, and the inclination angle of the outer frame 1 can be known.

As described above, the elastic plate 31 is supported at three points by the support plate 30, so that the support portion 30 of the support plate 30 is supported.
Even if the heights of a, 30b, and 30c vary slightly,
Even if the heights of the projections 32a, 32b, 32c of the pressing body 32 vary, even if the flatness of the elastic plate 31 is slightly poor,
Since a correct amount of distortion is applied to each of the distortion resistors 33a, 33b, and 33c, a high-precision sensor can be realized with low-precision components. Further, since the support portions 30a, 30b, 30c and the strain resistors 33a, 33b, 33c are arranged in a substantially equilateral triangle, it is easy to determine in which direction the load is applied from the amounts of change of the three strain resistors. Can be calculated.

The number of load application points is three. However, the number of load application points may be two or more as long as the load application point connects the support parts 30a, 30b, and 30c.

(Embodiment 2) As shown in FIG.
4 has hemispherical support parts 34a, 34b, 34c,
These three points support the elastic plate 31. The pressure body 35 is mechanically fixed to the hanging rod 29. On the lower surface of the pressurizing body 35, there are convex portions 35a, 35b, 35c in the shape of a semicylindrical shape located between the support portions 34a, 34b, 34c, and the strain resistor fixed to the elastic plate 31 at these three points. 33a, 33b,
A load is applied to the position 33c. Kamaboko convex part 35a,
35b and 35c are arranged so as to intersect the distortion resistors 33a, 33b and 33c at right angles. Other configurations are the same as those in the first embodiment.

In the above configuration, the amount of distortion of one of the distortion resistors 33b will be described in comparison with the first embodiment.
In the first embodiment, the elastic plate 31 is supported by the support portion 30 of the support plate 30.
a, 30b, and the convex portion 3 of the pressing body 32
The load applied to the pressing body 32 is applied by 2b. Therefore, the amount of strain of the strain resistor 33b depends on the amount of the support portions 30a, 30b.
, The elastic constant of the elastic plate 31, and the load applied to the projection 32b.

However, if the support portions 30a and 30b are received on the surface, the contact with the elastic plate 31 becomes unclear,
In particular, when the support plate 30 warps due to temperature change, the contact point changes,
The distance between the support portions 30a and 30b and the contact point will change, and the strain amount of the strain resistor 33b will change. Therefore, when this support portion is made hemispherical as shown in FIG. 3, point contact occurs, and such a problem does not occur. The same can be said for the convex portion 32b of the pressing body 32. Therefore, as shown in FIG. 3, by forming the convex portion 35b of the pressing body 35 in a semi-cylindrical shape and arranging it so as to intersect at right angles with the strain direction of the strain resistor 33b, one point determined by the strain resistor 33b is obtained. Stress can be applied in a similar manner.

As described above, since the fulcrum and the pressing point of the elastic plate 31 are stabilized, the amount of strain applied to the strain resistor becomes accurate even when the conditions such as the temperature change, and the amount of water in the washing tub 5 and the amount of water charged therein. You can know the amount of laundry.

In this embodiment, the support portions 34a, 34b and 34c of the support plate 34 are hemispherical, and the convex portions 35a, 35b and 35c of the pressurizing body 35 are in the shape of a semicircle. The parts 34a, 34b, and 34c are in the shape of a semicircle,
The convex portions 35a, 35b, 35c of the pressurizing body 35 may have a hemispherical shape.

(Embodiment 3) As shown in FIG.
6 mechanically fixes the pressing body 35, and makes the hanging rod 36 have elasticity in a direction perpendicular to the axis.
As shown in FIG. 5, the elliptical shape has a major axis in the center direction and a minor axis in the rotation direction. Other configurations are the same as those of the second embodiment.

The operation of the above configuration will be described. In the configuration of FIG. 10 described in the conventional example, the sliding body 27 is interposed between the hanging bar 2 and the pressing body 26, and the angular variation of the hanging bar 2 is applied to the pressing body 26 as the movement of the center of gravity. However, in the present invention, the sliding body is omitted, and the angular variation of the hanging bar 36 is changed by the pressing body 35 mechanically fixed to the hanging bar 36 as the variation of the directly applied stress of the strain resistors 33a, 33b, 33c. Applied to the position.

For this reason, it is possible to linearly apply to the positions of the strain resistors 33a, 33b and 33c in the same mode from a level at which the fluctuation of the angle of the hanging rod 36 is small to a large vibration. That is, in the conventional configuration, the small level before the sliding body 27 starts to slide is the same mode as that of the present invention, and if it exceeds that, the mode changes to the center of gravity shift mode, and it is difficult to detect the small level. In addition, it is necessary to increase the amount of deflection of the elastic plate 24. However, in the present invention, the amount of deflection of the elastic plate 31 is not increased, and the suspension rod 36 is provided with a spring property in a direction perpendicular to the axis to solve this problem. doing.

The amount of vibration in the water receiving tank 3 is several times greater in the rotational direction than in the direction from the center of the tank to the outside. If the elastic constant of the hanging rod 36 is determined in accordance with the large vibration, the sensitivity of detecting vibration in the direction outside the center of the tank decreases. Therefore, in the present invention, the elastic coefficient of the suspension bar 36 is changed in the rotation direction and the center direction so that detection can be performed with the optimum sensitivity in both of the two directions. As shown in FIG. 36 has an elliptical cross section. The cross-sectional shape may be rectangular.

As described above, by mechanically fixing the pressing body 35 and the hanging bar 36 and making the hanging bar 36 elastic, it is possible to accurately detect the angle variation of the hanging bar 36 from a small level to a large vibration. .

In this embodiment, the pressure member 3 of the second embodiment is used.
Although the hanging bar 36 having elasticity in the direction perpendicular to the axis is fixed to 5, the hanging rod 36 having elasticity in the direction perpendicular to the axis may be fixed to the pressing body 32 of the first embodiment. .

(Embodiment 4) As shown in FIG.
Numeral 7 denotes a strain resistor 33a, 33b, 33c, and a temperature compensating resistor 33 having the same composition as the strain resistor and made by the same method.
d, 33e and 33f are fixed. At the center of the elastic plate 37, there is an equilateral triangular hole 38, around which a slit 39 parallel to each side of the equilateral triangular hole 38 and having the same length as each side.
a, 39b and 39c are provided.

An equilateral triangle 38 and slits 39a, 39b,
Strain resistors 33a, 33b and 33c are fixed to the center of the strip formed between the slits 39a and 39c.
Temperature compensation resistors 33d, 33
e and 33f are fixed. 40a and 40b are fixing holes provided so that the elastic plate 37 does not move in the horizontal direction. 41 is an integrated circuit, 42 is a resistor, and forms the amplifier 19.

The resistance change amounts of the strain resistors 33a, 33b and 33c are connected so as to be amplified by the amplifier 19 composed of the integrated circuit 41, the resistor 42 and the like.
3d, 33e and 33f are the strain resistors 33a, 33b and 3
It is connected so as to compensate for the temperature change of 3c.

Further, the elastic plate 37 supports the intersection on the extension line of each strip formed by the regular triangle hole 38 and the slits 39a, 39b, 39c from the outer frame 1 side with the support section, and The projections are configured to be located at the positions of the strain resistors 33a, 33b, and 33c. Other configurations are the same as those in the first or second embodiment.

The operation of the above configuration will be described. First,
The portion to which the load is applied is defined by a regular triangular hole 38 and a slit 3.
9a, 39b, and 39c are formed in a rectangular shape, and intersections on extensions of the respective rectangular shapes are supported from the outer frame 1 side, and a load is applied to the positions of the strain resistors 33a, 33b, and 33c. In addition, distortion due to the application of a load occurs only in a rectangular shape, and hardly occurs in other portions. Therefore, on the same substrate (elastic body 37), the strain resistors 33a, 33b, 3
3c together with the amplifier 19 and the temperature compensating resistor 33
d, 33e, and 33f can be formed.

The strain resistors 33a, 33b, 3
By providing 3c and the amplifier 19, both can be connected with the shortest distance, so that noise resistance can be improved. Also, the strain resistors 33a, 33
b, 33c and temperature compensating resistors 33d, 33e, 33f
Can be fixed at the same time, so that both can be printed and formed at the same time, and resistors having exactly the same characteristics can be easily formed and can be arranged immediately close to each other, so that the temperature change of the strain resistors 33a, 33b, 33c is reliably compensated. be able to.

(Embodiment 5) As shown in FIG.
7 are support portions 43a, 43b, 43 provided on the support plate 43.
c (43b is not shown), and the support plate 43 has elastic plate fixing rods 43d and 43e. The pressing body 44 is
4a, 44b, 44c (44b is not shown), which is mechanically fixed to the suspension rod 29, and is configured so that the elastic plate 37 intersects the suspension rod 29 at a substantially right angle. Other configurations are the same as those of the fourth embodiment.

The operation of the above configuration will be described. Since the hanging rod 29 hangs the water receiving tank 3 on the outer frame 1, the upper side is inclined outward by about 7 degrees. Therefore, in the present invention, the support plate 43 is inclined by about 7 degrees so that the elastic plate 37 and the suspension rod 29 intersect at a substantially right angle, so that horizontal stress does not act on the elastic plate 37 and the pressing body 44. .

Thus, the elastic plate fixing rods 43d, 43e
The stress acting between the elastic member 37 and the pressing body 44 becomes substantially zero, and the weight applied to the hanging rod 29 can be accurately applied to the strain resistors 33a, 33b, and 33c.

In this embodiment, the elastic plate 3 of the fourth embodiment is used.
7 is formed so as to intersect at a substantially right angle with respect to the hanging rod 29, but the elastic plates of Examples 1 to 3 can be similarly formed so as to intersect at substantially a right angle with the hanging rod, and the same applies. The operation and effect can be obtained.

[0052]

As described above, according to the first aspect of the present invention, the amount of change in the strain resistor disposed between one of the hanging rods and the outer frame affects the water receiving tank. A sensor for detecting at least one of a weight, a vibration amount, a vibration period, and an inclination angle of the outer frame, wherein the sensor has a plurality of strain resistors fixed to an elastic plate, and the elastic member is fixed at three points from the outer frame It supports the plate, and is configured to apply the weight of the water receiving tank through a pressurized body mechanically fixed to the upper part of the hanging rod in each of the support points, so that the support portion of the support plate is Even if there is a slight variation in height, even if the flatness of the elastic plate is slightly bad, the correct amount of strain can be applied to each strain resistor with the load applied between each support point for three-point support, It can accurately detect the amount of laundry, the amount of water, the amount of vibration of the washing and dewatering tub, the vibration cycle, etc. It is possible to remove the hysteresis phenomenon. In addition, the change in the angle of the hanging rod can be changed to the change in the load, accurately applied to each strain resistor, and detected.

According to the second aspect of the present invention, the outer frame is provided with a support plate having three points of support portions arranged in a substantially equilateral triangle, and a strain resistance is provided at a position substantially in the middle of the support portions. An elastic plate to which the body is fixed is disposed on the support plate, and 3
A pressing body having two convex portions is disposed on the elastic plate such that the convex portion comes to the position of the strain resistor, and the load of the hanging bar is applied to the pressing body. Even if there is a slight variation in the height of the support portion of the plate, a variation in the height of the convex portion of the pressing body, or even if the flatness of the elastic plate is slightly poor, the correct amount of distortion is Since it is added, it is possible to accurately detect the amount of laundry, the amount of water, the amount of vibration of the washing and dewatering tub, the vibration cycle, and the like with low accuracy. Further, since the support portion and the strain resistors are arranged in a substantially equilateral triangle, it is possible to easily calculate in which direction the load is applied from the amounts of change of the three strain resistors.

According to the third aspect of the present invention, the support portion of the support plate and the convex portion of the pressing body are linear or dotted in a direction perpendicular to the direction of the strain resistor. , The supporting point and the pressing point of the elastic plate become almost one point with respect to the strain resistor,
The amount of strain applied to the strain resistor becomes more accurate,
It is possible to more accurately detect the amount of water, the amount of vibration of the washing and dewatering tub, the vibration period, and the like.

According to the fourth aspect of the present invention, the suspension rod and the pressing body are mechanically fixed, and the suspension rod has elasticity in a direction perpendicular to the axis. In addition to being able to accurately transmit to the strain resistor, a part of the vibration of the water receiving tank can be absorbed by the hanging rod so that excessive stress is not applied to the elastic plate.

According to the fifth aspect of the present invention, the elastic constant of the hanging rod is large with respect to the stress in the direction connecting the center of the washing and dewatering tub and the hanging rod, and small with respect to the stress in the rotating direction. Because the vibration that goes out from the center of the washing and spin-drying tub, which has a relatively small amount of vibration, and the large vibration in the rotating direction can be applied to the strain resistor by changing the sensitivity, the entire vibration can be dynamically adjusted by the strain resistor. It can be detected in the range.

According to the sixth aspect of the present invention, the elastic plate has a substantially equilateral triangular hole substantially at the center, and a length substantially parallel to the side of the hole at a predetermined distance from the hole. A slit is provided, and a strain resistor is fixed to substantially the center of a strip formed by the hole and the slit, and an amplifier that amplifies a change amount of the strain resistor outside the slit and a resistor having the same composition as the strain resistor. Since the body is provided, wiring such as lead wires between the strain resistor and the amplifier is not required, noise resistance can be improved, and the temperature of the strain resistor can be compensated by the resistor provided in the peripheral part. Therefore, a stable signal can be output with respect to a temperature change.

According to the seventh aspect of the present invention, since the elastic plate is formed so as to intersect the suspension rod substantially at a right angle, the stress acting on the elastic plate in the horizontal direction is reduced. The structure for preventing the horizontal movement is simplified, and the detection error due to the stress acting in the horizontal direction can be reduced.

[Brief description of the drawings]

FIG. 1 is a sectional view of a washing machine according to a first embodiment of the present invention.

FIG. 2A is an enlarged sectional view of a sensor of the washing machine. FIG. 2B is an enlarged top view of a sensor of the washing machine.

FIG. 3A is a sectional view of a sensor of the washing machine according to the second embodiment of the present invention. FIG. 3B is a top view of the sensor of the washing machine.

FIG. 4 is a sectional view of a sensor to which a hanging bar of a washing machine according to a third embodiment of the present invention is attached.

FIG. 5 is an enlarged sectional view of a hanging rod of the washing machine.

FIG. 6 is a top view of a sensor according to a fourth embodiment of the present invention.

FIG. 7A is a sectional view of a sensor of a washing machine according to a fifth embodiment of the present invention. FIG. 7B is a top view of the sensor of the washing machine.

FIG. 8 is a sectional view of a conventional washing machine.

FIG. 9 is a circuit block diagram of the washing machine.

10A is an enlarged sectional view of a sensor of the washing machine. FIG. 10B is an enlarged top view of a sensor of the washing machine.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Outer frame 3 Water receiving tank 5 Washing and dewatering tank 7 Motor (drive means) 13 Control device 28 Sensor 29 Hanging rod 31 Elastic plate 32 Pressing body 33a Strain resistor 33b Strain resistor 33c Strain resistor

──────────────────────────────────────────────────続 き Continuation of the front page (51) Int.Cl. ⁶ Identification code FI D06F 37/24 D06F 37/24 E (72) Inventor Fumio Ota 1006 Kazuma Kazuma, Kadoma City, Osaka Matsushita Electric Industrial Co., Ltd.

Claims (7)

[Claims] 1. An outer frame, a water receiving tank suspended in the outer frame by a plurality of hanging rods, a washing and dewatering tank rotatably disposed in the water receiving tank, and the washing and dewatering tank. And a control device for controlling the driving means and the like, and a weight that is disposed between one of the hanging rods and the outer frame and that is applied to the water receiving tank based on a change amount of the strain resistor. A sensor for detecting at least one of a vibration amount, a vibration period, and an inclination angle of the outer frame, wherein the sensor has a plurality of strain resistors fixed to an elastic plate, and the elastic plate is provided at three points from the outer frame side. A washing machine configured to support the weight and apply the weight of the water receiving tub via a pressurizing body mechanically fixed to an upper portion of the hanging bar in each of the support points. 2. A support plate having three points of support arranged in a substantially equilateral triangle on an outer frame, and elastic plates each having a strain resistor fixed to a position substantially in the middle of the support are provided on the support plate. And a pressing body having three convex portions on the lower surface is disposed on the elastic plate such that the convex portion comes to the position of the strain resistor, and the load of the hanging bar is applied to the pressing body. The washing machine according to claim 1, wherein the washing machine is configured as described above. 3. The support portion of the support plate and the convex portion of the pressurizing body,
3. The washing machine according to claim 2, wherein the washing machine is linear or dotted in a direction perpendicular to the direction of the strain resistor. 4. The washing machine according to claim 1, wherein the hanging bar and the pressing body are mechanically fixed, and the hanging bar has elasticity in a direction perpendicular to the axis. 5. The washing machine according to claim 4, wherein the elastic constant of the hanging bar is large with respect to the stress in the direction connecting the center of the washing and dewatering tub and the hanging bar, and small with respect to the stress in the rotating direction. 6. The elastic plate has a substantially equilateral triangular hole substantially at the center, a slit having a length substantially equal to the side of the hole at a predetermined distance from the hole, and formed by the hole and the slit. 3. A strain resistor is fixed substantially at the center of the strip, and an amplifier for amplifying an amount of change of the strain resistor and a resistor having the same composition as the strain resistor are provided outside the slit. Washing machine. 7. The washing machine according to claim 1, wherein the elastic plate is formed so as to intersect at a substantially right angle with the hanging bar.